agent: add adapter for Allegro

[alectimison-maker]

Summary

• add a focused Allegro.pl site adapter for Chrome and Firefox
• guide the agent through sponsored placements, grouped variants and sellers, cart review, quick purchase, and conditional Smart! delivery
• cover trusted storefront URLs, lookalike hosts, other Allegro country sites, and Chrome/Firefox parity

Motivation

Allegro.pl is listed as a high-priority regional site in CONTRIBUTING.md, but it had no adapter. The current search UI mixes Sponsorowane/Promowane placements with ordinary results, exposes a delivered-price sort, and can group multiple offers behind one product card. Without site guidance, an agent can mistake a paid/default result for the cheapest offer or enter the kup i zapłać quick-purchase path before the user reviews delivery and payment details.

The guidance was checked against the current search surface, Allegro's cart documentation, and its buyer flow documentation.

Design

• match only allegro.pl and www.allegro.pl
• deliberately exclude Allegro Lokalnie, lookalike hosts, and other country storefronts that need separate localization research
• keep the six guidance bullets byte-identical across Chrome and Firefox
• avoid hard-coding a Smart! threshold because eligibility depends on the seller, delivery method, and the account's current terms

Testing

• node --check src/chrome/src/agent/adapters.js — passed
• node --check src/firefox/src/agent/adapters.js — passed
• git diff --check — passed
• node test/security/injection-corpus.mjs — 60/60 passed
• node test/run.js — new Allegro coverage passed; 1387 passed overall, with the existing unrelated version/CHANGELOG mismatch still failing (26.0.1 vs 26.0.0)

Compatibility and risks

This only adds a new exact-host adapter and does not change behavior on existing sites. The UI guidance is dated 2026-07 so future label drift is visible to maintainers.

Scope

Allegro Lokalnie and the Czech, Slovak, and Hungarian Allegro storefronts are intentionally deferred until their localized flows are researched independently.

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